This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1885 Excerpt: ...Movements of the Nostrils and of the
Glottis.--During the action of the muscles which directly draw air
into the chest, those which guard the opening through which it
enters are not passive. In hurried breathing the instinctive
dilatation of the nostrils is well seen, although under ordinary
conditions it may not be noticeable. The opening at the upper part
of the larynx, however, or rima glottidis (Fig. 297), b dilated at
each inspiration, for the more ready passage of air, and becomes
smaller at each expiration; its condition, therefore, corresponding
during respiration with that of the walls of the chest. There is a
further likeness between the two acts in that, under ordinary
circumstances, the dilatation of the rima glottidis is a muscular
act, and itc contraction chiefly an elastic recoil; although, under
various conditions, to be hereafter mentioned, there may be, in the
contraction of the glottis, considerable muscular power exercised.
Terms used to express Quantity of Air breathed.--Breathing or /../,
// air, is the quantity of air which is habitually and almost
uniformly changed in each act of breathing. In a healthy adult man
it is about 30 cubic inches. Complemental air, is the quantity over
and above this which can be drawn into the lungs in the deepest
inspiration; its amount is various, as will be presently shown.
Reserve air. After ordinary expiration, such as that which expels
the breathing or tidal air, a certain quantity of air remains in
the lungs, which may be expelled by a forcible and deeper
expiration. This is termed reserve air. Residual air is the
quantity which still remains in the lungs after the most violent
expiratory effort. Its amount depends in great measure on the
absolute size of the chest, but may be estimated at about 100..
|Country of origin:
William Senhouse Kirkes
||246 x 189 x 8mm (L x W x T)
||Paperback - Trade
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